closes #345410: two_lines_rset, two_cols_rset, two_etypes_rset are badly named replaced by multi_lines_rset, multi_columns_rset, multi_etypes_rset, all taking optional 'nb' argument allowing to specify and exact count. Bw compat is kept, usage of deprecated function updated in cw itself. Also drop custom at_least_two_columns selector (in views.plots) since it was the same as multi_columns_rset. Hopefuly the renaming will help in avoid such pb... We should now decide if we want to deprecate one_* selector in favor of multi_*(nb=1). See note on this at then end of selectors.py

/***************************************/
/* Manage view (views/startup.py)      */
/***************************************/

table.startup {
  width: 100%;
}

table.startup td {
  padding: 0.1em 0.2em;
}

table.startup td.addcol {
  text-align: right;
  width: 0.5em;
}

table.startup th{
  padding-top: 3px;
  padding-bottom: 3px;
  text-align: left;
}